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In this commit, we extend the WitnessGenerator type to now return an InputScript. This allows it to be more encompassing, as now callers can expect a sigScript to be populated if the input being swept requires a sigScript field. Along the way, we've also renamed input.BuildWitness to input.CraftInputScript. We also take a step towards allowing the sweeper to sweep transactions for n2pwkh outputs. We do so by modifying the BuiltWitness method to instead return an InputScript. Additionally, when populating inputs if a sigScript is present, it will now be populated.